Weather Records on 20 August 1990

1,262 weather records were set or tied worldwide on 20 August 1990. Highest significance: Portola, US.

Key Facts for 20 August 1990

On 20 August 1990, 1,262 weather records were set or tied at long-record stations worldwide.
225 were record highs and 401 were record lows, counting maximum and minimum temperature.
By timescale, 1 were all-time records, 34 monthly and 1,227 daily.
Portola set a monthly record daily precipitation of 51.3 mm (2.0 in) on 20 August 1990.
Across 163 earlier years (1797 to 2026) the same calendar date averaged 450 records.

Record Map

1,262 stations

1,262 station records on 20 August 1990 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 20 August 1990: highest significance records shown on the map
Station	Country	Type	Value	Significance
Portola	United States	Record daily precipitation	51.3 mm (2.0 in)	64 of 100 (Major)
Habary	Russia	Record daily precipitation	37.6 mm (1.5 in)	61 of 100 (Major)
Itariri	Brazil	Record daily precipitation	66.4 mm (2.6 in)	60 of 100 (Major)
Mountainair	United States	Record daily precipitation	62.2 mm (2.4 in)	60 of 100 (Major)
Oksoey Fyr	Norway	Record daily precipitation	67.9 mm (2.7 in)	58 of 100 (Notable)
Iowa City	United States	Record daily precipitation	93.2 mm (3.7 in)	58 of 100 (Notable)
Toms River	United States	Record daily precipitation	114.3 mm (4.5 in)	56 of 100 (Notable)
Martinsburg E W Virginia Rgnl	United States	Record daily precipitation	54.6 mm (2.1 in)	55 of 100 (Notable)
Luverne	United States	Record daily precipitation	46.2 mm (1.8 in)	53 of 100 (Notable)
Usina Sao Jose	Brazil	Record daily precipitation	46.9 mm (1.8 in)	51 of 100 (Notable)
Waseca S Rsch & Outreach Ctr	United States	Record daily precipitation	102.1 mm (4.0 in)	50 of 100 (Notable)
Clarksburg 1	United States	Record daily precipitation	64.8 mm (2.6 in)	50 of 100 (Notable)
Bocaina (Fazenda Santa Clara)	Brazil	Record daily precipitation	38.8 mm (1.5 in)	49 of 100 (Notable)
Cachoeira Paulista (Pcd)	Brazil	Record daily precipitation	39.0 mm (1.5 in)	49 of 100 (Notable)
Okulovka	Russia	Record daily precipitation	37.9 mm (1.5 in)	48 of 100 (Notable)
Novaja Ladoga	Russia	Record daily precipitation	48.0 mm (1.9 in)	47 of 100 (Notable)
Cape St. Lucia	South Africa	Record daily precipitation	62.0 mm (2.4 in)	47 of 100 (Notable)
Fairmont	United States	Record daily precipitation	43.4 mm (1.7 in)	47 of 100 (Notable)
Caraguatatuba	Brazil	Record daily precipitation	47.5 mm (1.9 in)	46 of 100 (Notable)
Pariquera-Acu	Brazil	Record daily precipitation	42.2 mm (1.7 in)	46 of 100 (Notable)
Dixon Wwtp	United States	Record daily precipitation	64.3 mm (2.5 in)	45 of 100 (Notable)
Everett	United States	Record daily precipitation	91.7 mm (3.6 in)	45 of 100 (Notable)
Nariel Creek (Simpson)	Australia	Record daily precipitation	31.0 mm (1.2 in)	44 of 100 (Notable)
Jacupiranga	Brazil	Record daily precipitation	45.1 mm (1.8 in)	44 of 100 (Notable)
Gibson Dam	United States	Record daily precipitation	46.7 mm (1.8 in)	44 of 100 (Notable)
W Pt	United States	Record low maximum temperature	20.0 C (68.0 F)	44 of 100 (Notable)
Angatuba	Brazil	Record daily precipitation	42.6 mm (1.7 in)	43 of 100 (Notable)
Ljuban	Russia	Record daily precipitation	26.9 mm (1.1 in)	43 of 100 (Notable)
Nongoma	South Africa	Record daily precipitation	60.0 mm (2.4 in)	43 of 100 (Notable)
Madison	United States	Record low minimum temperature	0.6 C (33.1 F)	43 of 100 (Notable)
Plainfield	United States	Record low maximum temperature	18.9 C (66.0 F)	43 of 100 (Notable)
Summit Lake	United States	Record daily precipitation	47.0 mm (1.9 in)	43 of 100 (Notable)
Mason City 4SE	United States	Record daily precipitation	58.2 mm (2.3 in)	42 of 100 (Notable)
Ny City Cntrl Park	United States	Record low maximum temperature	20.0 C (68.0 F)	42 of 100 (Notable)
Fuzhou	China	Record daily precipitation	126.1 mm (5.0 in)	41 of 100 (Notable)
Taunton	United States	Record low maximum temperature	19.4 C (66.9 F)	41 of 100 (Notable)
Middletown 2 NW	United States	Record low maximum temperature	17.8 C (64.0 F)	41 of 100 (Notable)
Port Jervis	United States	Record low maximum temperature	17.8 C (64.0 F)	41 of 100 (Notable)
Clarion 3 SW	United States	Record daily precipitation	55.6 mm (2.2 in)	41 of 100 (Notable)
Marcus Hook	United States	Record low maximum temperature	17.8 C (64.0 F)	41 of 100 (Notable)
Engordador	Brazil	Record daily precipitation	42.3 mm (1.7 in)	40 of 100 (Notable)
Aracaiba (Capoeiras)	Brazil	Record daily precipitation	46.7 mm (1.8 in)	40 of 100 (Notable)
Tohmajarvi Kemie	Finland	Record daily precipitation	27.6 mm (1.1 in)	40 of 100 (Notable)
Monticello	United States	Record high minimum temperature	23.9 C (75.0 F)	40 of 100 (Notable)
Anderson 1 N	United States	Record daily precipitation	50.0 mm (2.0 in)	40 of 100 (Notable)
Alma	United States	Record low maximum temperature	17.8 C (64.0 F)	40 of 100 (Notable)
Arcade	United States	Record low maximum temperature	16.1 C (61.0 F)	40 of 100 (Notable)
Avon	United States	Record low maximum temperature	17.2 C (63.0 F)	40 of 100 (Notable)
Mohonk Lake	United States	Record low maximum temperature	16.1 C (61.0 F)	40 of 100 (Notable)
Barra Do Braco	Brazil	Record daily precipitation	36.7 mm (1.4 in)	39 of 100 (Notable)
Postville	United States	Record low maximum temperature	19.4 C (66.9 F)	39 of 100 (Notable)
Williamsburg 1E	United States	Record daily precipitation	103.9 mm (4.1 in)	39 of 100 (Notable)
Atlanta 5 WNW	United States	Record daily precipitation	50.8 mm (2.0 in)	39 of 100 (Notable)
Hastings	United States	Record low maximum temperature	20.0 C (68.0 F)	39 of 100 (Notable)
Peterboro 2 S	United States	Record low maximum temperature	18.9 C (66.0 F)	39 of 100 (Notable)
Flandreau	United States	Record low maximum temperature	16.1 C (61.0 F)	39 of 100 (Notable)
Tomazina	Brazil	Record daily precipitation	62.5 mm (2.5 in)	38 of 100 (Notable)
Mairipora	Brazil	Record daily precipitation	36.4 mm (1.4 in)	38 of 100 (Notable)
Newport	United States	Record high minimum temperature	25.0 C (77.0 F)	38 of 100 (Notable)
Le Mars	United States	Record low maximum temperature	20.0 C (68.0 F)	38 of 100 (Notable)

Counts by Type and Timescale

1,262 records

Records set or tied on 20 August 1990 by type: Highest daily maximum 116, Lowest daily maximum 296, Highest daily minimum 109, Lowest daily minimum 105, Heaviest daily rainfall 636.

Records on 20 August 1990 by type
Record type	Records
Highest daily maximum	116
Lowest daily maximum	296
Highest daily minimum	109
Lowest daily minimum	105
Heaviest daily rainfall	636
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 20 August 1990 by timescale: all-time 1, monthly 34, daily 1,227.

How Much Records Were Beaten By

1,038 broken records

Margins by which the 1,038 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 66.2. Ties are not counted.

Top 20 by Significance

20 August 1990

Top 20 records on 20 August 1990 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
20 August 1990	Portola, US	monthly rain	51.3 mm (2.0 in)	32.2 mm (1.3 in)	25 years	64 of 100 (Major)
20 August 1990	Habary, RU	daily rain	37.6 mm (1.5 in)	32.3 mm (1.3 in)	53 years	61 of 100 (Major)
20 August 1990	Itariri, BR	daily rain	66.4 mm (2.6 in)	55.4 mm (2.2 in)	52 years	60 of 100 (Major)
20 August 1990	Mountainair, US	daily rain	62.2 mm (2.4 in)	34.3 mm (1.4 in)	45 years	60 of 100 (Major)
20 August 1990	Oksoey Fyr, NO	daily rain	67.9 mm (2.7 in)	50.1 mm (2.0 in)	27 years	58 of 100 (Notable)
20 August 1990	Iowa City, US	daily rain	93.2 mm (3.7 in)	43.4 mm (1.7 in)	68 years	58 of 100 (Notable)
20 August 1990	Toms River, US	daily rain	114.3 mm (4.5 in)	62.7 mm (2.5 in)	51 years	56 of 100 (Notable)
20 August 1990	Martinsburg E W Virginia Rgnl, US	daily rain	54.6 mm (2.1 in)	26.7 mm (1.1 in)	88 years	55 of 100 (Notable)
20 August 1990	Luverne, US	daily rain	46.2 mm (1.8 in)	31.5 mm (1.2 in)	72 years	53 of 100 (Notable)
20 August 1990	Usina Sao Jose, BR	daily rain	46.9 mm (1.8 in)	41.4 mm (1.6 in)	20 years	51 of 100 (Notable)
20 August 1990	Waseca S Rsch & Outreach Ctr, US	daily rain	102.1 mm (4.0 in)	46.0 mm (1.8 in)	43 years	50 of 100 (Notable)
20 August 1990	Clarksburg 1, US	daily rain	64.8 mm (2.6 in)	42.7 mm (1.7 in)	40 years	50 of 100 (Notable)
20 August 1990	Bocaina (Fazenda Santa Clara), BR	daily rain	38.8 mm (1.5 in)	33.4 mm (1.3 in)	13 years	49 of 100 (Notable)
20 August 1990	Cachoeira Paulista (Pcd), BR	daily rain	39.0 mm (1.5 in)	29.3 mm (1.2 in)	56 years	49 of 100 (Notable)
20 August 1990	Okulovka, RU	daily rain	37.9 mm (1.5 in)	28.4 mm (1.1 in)	28 years	48 of 100 (Notable)
20 August 1990	Novaja Ladoga, RU	daily rain	48.0 mm (1.9 in)	39.8 mm (1.6 in)	13 years	47 of 100 (Notable)
20 August 1990	Cape St. Lucia, ZA	daily rain	62.0 mm (2.4 in)	48.0 mm (1.9 in)	39 years	47 of 100 (Notable)
20 August 1990	Fairmont, US	daily rain	43.4 mm (1.7 in)	31.0 mm (1.2 in)	61 years	47 of 100 (Notable)
20 August 1990	Caraguatatuba, BR	daily rain	47.5 mm (1.9 in)	35.4 mm (1.4 in)	25 years	46 of 100 (Notable)
20 August 1990	Pariquera-Acu, BR	daily rain	42.2 mm (1.7 in)	28.1 mm (1.1 in)	25 years	46 of 100 (Notable)

Significance is a score from 0 to 100 combining margin, the age of the old record and the length of the station's record. How it is computed.

The Same Date in Other Years

1797 to 1990

Records set or tied on this calendar date in each year from 1797 to 1990. 1990 had 1,262 records.

Counts for years before the ledger starts come from the same station rules.

Records on 08-20 in each year
Year	Records
1797	1
1807	1
1809	2
1816	1
1830	1
1832	1
1838	1
1840	1
1842	1
1846	1
1849	1
1850	1
1852	1
1858	3
1863	5
1867	4
1870	3
1871	1
1873	1
1875	2
1877	1
1883	2
1884	2
1885	6
1886	1
1888	1
1889	2
1890	2
1891	2
1892	6
1893	1
1894	1
1895	1
1896	5
1897	6
1898	1
1899	5
1900	7
1901	12
1902	3
1903	7
1904	30
1905	7
1906	26
1907	15
1908	21
1909	69
1910	7
1911	18
1912	25
1913	23
1914	15
1915	14
1916	74
1917	51
1918	69
1919	25
1920	47
1921	23
1922	52
1923	83
1924	132
1925	193
1926	187
1927	338
1928	101
1929	213
1930	318
1931	214
1932	299
1933	324
1934	376
1935	339
1936	543
1937	537
1938	250
1939	448
1940	695
1941	230
1942	429
1943	436
1944	355
1945	398
1946	349
1947	988
1948	403
1949	431
1950	1,341
1951	824
1952	425
1953	441
1954	476
1955	848
1956	678
1957	342
1958	281
1959	764
1960	465
1961	520
1962	684
1963	577
1964	629
1965	470
1966	1,094
1967	657
1968	862
1969	608
1970	414
1971	585
1972	522
1973	490
1974	565
1975	411
1976	894
1977	860
1978	563
1979	1,009
1980	991
1981	856
1982	620
1983	1,465
1984	696
1985	666
1986	819
1987	564
1988	991
1989	603
1990	1,262
1991	804
1992	1,168
1993	759
1994	719
1995	1,113
1996	900
1997	1,214
1998	802
1999	810
2000	989
2001	909
2002	1,208
2003	1,031
2004	1,333
2005	1,112
2006	851
2007	1,955
2008	1,170
2009	1,414
2010	1,028
2011	987
2012	1,086
2013	545
2014	582
2015	1,075
2016	872
2017	324
2018	657
2019	698
2020	1,051
2021	1,028
2022	1,038
2023	1,479
2024	589
2025	1,134
2026	985

Download the Data

Data for records on 1990-08-20: CSV or JSON. Field meanings are on the data page.

Sources: Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Made with Natural Earth. Public domain map data. Borders are Natural Earth's de facto depiction. Data as of 2026-10-17 (17 October 2026). Records are computed by this site and are not official.

Data as of 2026-10-16. Last revised 16 October 2026 (2026-10-16).

Margin	Records
0 to 10	789
10 to 20	156
20 to 30	59
30 to 40	20
40 to 50	10
50 to 60	2
60 to 70	2